Your error refers to a web call to our server, I just ran a Postman test from my PC using the same call as the algo builder tool and everything is fine, it's a strange error that could probably only be solved by digging into your computer which we cannot do.
https://www.postman.com/product/rest-client/
A HTTP 404 error happens when a resource is unavailable. The client (web browser) received a message from the server (remote computer) that the specific resource (web page/URL) is unavailable.
Maybe the server was under maintenance today, I would try again.
